Remove workaround for WindowsCopilotRuntime/cs-winforms-sparse sample

[ssparach]

Description

This PR removes the workaround for a bug where the OCR model returns with an "interface not registered" error. This sample was updated to WindowsAppSDK version 1.8-exp1 where the issue no longer reproduces.

Target Release

The example currently targets the 1.8-experimental1 which contains the WCR API. However, this will be updated in the future to target the stable release when it becomes available.

Checklist

Note that /azp run currently isn't working for this repo.

• Samples build and run using the Visual Studio versions listed in the Windows development docs.
• Samples build and run on all supported platforms (x64, x86, ARM64) and configurations (Debug, Release).
• Samples set the minimum supported OS version to Windows 10 version 1809.
• Samples build clean with no warnings or errors.
• [For new samples]: Samples have completed the sample guidelines checklist and follow standardization/naming guidelines.
• Microsoft employees only: you can validate your changes by following the instructions here: https://www.osgwiki.com/wiki/WindowsAppSDK-Samples